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Interval arithmetic for Axiom was implemented by Mike Dewar in form of Aldor files. Juergen Weiss converted the files to Spad and they are included in current FriCAS distribution.

fricas
x:=interval(1.1,2.2)$Interval(Float)

\label{eq1}\left[{1.1}, \:{2.2}\right](1)
Type: Interval(Float)
fricas
sin(x)

\label{eq2}\left[{0.8084964038 \_ 1959018429}, \:{1.0}\right](2)
Type: Interval(Float)




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